Low-carbon ultra-low sulfur steel smelting method

Abstract

The invention discloses a low-carbon ultra-low sulfur steel smelting method. The method comprises the following technological processes: pouring molten iron into a tank, pretreatment of molten iron, oxygen remaining operation of a converter, RH furnace vacuum decarburization, alloying and vacuum degassing in an RH furnace, deoxidization of aluminium yarn/aluminium wire in an LF refining furnace, slagging by using lime and CCM. Through combination of molten iron desulphurization and drossing, optimization of a converter steel tapping and oxygen remaining system and a slagging system, the vacuum decarburization, alloying and degassing control in the RH furnace, and the aluminium wire diffusing deoxidation slagging and aluminium wire sediment deoxidation in the LF furnace, deep decarburization and desulphurization are carried out. With an emphasis on combination of convertor steel tapping and oxygen remaining operations, RH deep decarburization and LF furnace deep desulphurization, technical optimization is carried out; due to reasonable ladle argon bottom blowing control in the smelting process, carbon content control and metallurgical thermodynamics and dynamics conditions of desulphurization are given a full play; the RH furnace decarburization is stable; LF furnace slagging and desulphurization and recarburization control effects are obvious; and low-carbon ultra-low sulfur steel smelting is achieved.

Description

technical field [0001] The invention belongs to a steelmaking process in the field of metallurgy, and relates to a process for controlling the carbon and sulfur content of smelting low-carbon and ultra-low-sulfur steel. Background technique [0002] Sulfur will have adverse effects on the performance of steel. High sulfur content in steel will deteriorate the hot working performance of steel, that is, cause the "hot brittleness" of steel. With the development of science and technology, the society has higher and higher requirements for steel materials, especially the development of anti-HIC and H2S corrosion-resistant steel. The sulfur content in the steel is required to be within 0.0010%. The desulfurization process can no longer fully meet the needs of large-scale production. Especially when some steels require low sulfur, in order to ensure the yield performance and welding performance, the carbon content needs to be controlled in a low range, but the deep desulfurizatio...

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Problems solved by technology

With the development of science and technology, the society has higher and higher requirements for steel materials, especially the development of anti-HIC and H2S corrosion-resistant steel. The sulfur content in the steel is required to be within 0.0010%. The desulfurization process can no longer fully meet the needs of large-scale production

Especially when some steels require low sulfur, in order to ensure the yield performance and welding performance, the carbon content needs to be controlled in a low range, but the deep desulfurization of the LF furnace leads to long heating time and serious carbon increase of the electrode, ultra-low sulfur and low carbon control Formed a contradiction

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